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Zinc Arsenide - Zn₃As₂

Classification: Arsnide
Atomic numbers: 30 & 33
Atomic weight: 346
Melting point (C): 1015
Boiling point (C):
Density (g/cm3): 4-5
Refractive index (n=): 1.66-1.72
Hardness (Mosh-scratch): 2.5-3
Crystal structure: Tetragonal-normal, Zn3As2: (100) prism, 2nd order, monoclinic-normal, ZnAs2: (100) a-pinacoid
Color (solid): Grey metal
Cleavage: b-pinacoid-perfect: (010)